Automatic lock



July 2, 1929. SWEARlNGEN 1.719,678

AUTOMATI C LOCK Filed Nov. 19, l927 2 Sheets-Sheet 1 &

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AUTOMATIC LOCK Filed Nov. 19, 1927 2 Sheets-Sheet 2? (I 6 Z l Y J J K I I K A fizvearz'zz yezg v l, NNNNN OR W 2 BY 16%;

WITNESS: ATTORNEY Patented July 2, 1929.

UNITED STATES THOMAS L. SWEARINGEN, OF DANVILLE, KENTUCKY. 4

AUTOMATIC LOCK.

Application filed November 19, 1927. Serial No. 234,497.-

This invention relates to a lock for angle cocks in the air line of railroad trains, the

parts, to'be hereinafter fully described, il-

lustrated in the accompanying drawings and specifically pointed out in the appended claim. 4

In describingmy invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which of an air line, at'a ing with the line.

Figure 2 is a section on line 2-2 of Figure 1. i

Figure 3 is a section on line 33 ure 2.

junction of the valve'casof Fig- Figure 4 is a horizontal sectional view 2 has a cap 4' threaded thereon which closes the end of the cylinder-and one wall of the extensionhas a passage 5 therein which is always in communication with the outer end of the cylinder and which will be connected with the interior ofthe air line by a port 5 when the plug-'B is in ope-n position, as clearly shown in Figure 2. A keeper recess 6 is made in the plug and is adapted to be engaged by the stem 7 of a plunger r passing through a hole in the casing A into through the port 5' and passage 5 into the outer end of the cylinder 1, thus acting on the piston and when the air pressure becomes greater than the pressure of sprin 9, the piston will be moved inwardly and t us the end of the stem 7 willvengage the keeper Gand lock the plug l3 against turning movement. When the air pressure in the line decreases to ,a point where the spring '9 is stronger than the air pressure, the plunger will be returned to its inoperative position so that the plug can be turned.

A bleedport 10 is formed in the cylinder 1 adjacent its bottom so as to permit air to pass into and-out of the cylinder as the piston moves in one direction or the other and this port also prevents airfrom accumulating in the cylinder 1 as it leaks past the piston which would act to counterbalance the air on the other side of the piston and thus render the device inoperative. The air escaping through the port 10, as it leaks past the piston, will act as a warning to the trainmcn that the piston is leaking. F igure 1s a sectional view through a part It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent-.-

I desire it to be understood that I may make changes in the construction and in the combination and arrangement ofthe several parts, provided that such changes fall Within the scope of the appended claim.

What I claim is In combination with a valve of an air line system including avalve casing and a rotary member therein, a lateral extension on the valve casing having a cylinder forming chamber in its outen part and an opening in its inner part connecting the chamber with the interior of the casing, the rotary mem ber of. the valve having a keeper recess therein and small port and the valve casing and the extension having a passage therein for connecting the outer end of the chamber with the port when the rotary member is in open position, a piston in the chamber, a stem connected with the piston and passing through theopening to en gage the keeper recess when the rotary member of the valve is in open position, a spring engaging the piston for normally holding the stem: out of engagement with the keeper recess and a cap threaded on the outer end of the extension and closing the chamber, a portion of the cap being spaced from a art of the extension, sald space connecting the outer end of the passage with the outer end ofthe chamber.

In testimony whereof I aifix my s1gnature.

THOMAS L. SWEARJINGEN. 

